If the initial concentration of the reactant in a first-order reaction is 0. 8 M and the reaction has a rate constant of 0. 173 s⁻¹, then how much of the reactant is left after 32 s?
(a) 0. 05 M
(b) 0. 1 M
(c) 0. 2 M
(d) 0. 003